1.He will not leave unless it is fine tomorrow.

2.Young as/though she is，she has travelled to many countries to put on shows.

3.He is always on time for school whether it rains or snows.

4.If you had come a few minutes earlier，you would have met him.

5.Though/Although he works hard，he makes little progress.

6.No matter which dictionary you want to buy，I'll pay for it.

7.However hard the condition is，you must work hard.

8.My grandfather still plays tennis now and then，even__though he's in his nineties.

9.One can always manage to do more things，no matter how full one's schedule is in life.

10.While/Although/Though I admit that there are problems，I don't agree that they cannot be solved.

Ⅱ.单句改错

1.She says that she'll have to close the shop if business improves.if→unless

2.I will go，if you come with me or stay at home.if→whether

3.-Would you like to go fishing with me tomorrow?

-Provide that you give me a lift in your car.Provide→Provided/Providing

4.Go there by bus instead of by bike in case of it rains.去掉第二个of

5.Child although he is，he can tell black from white.although→as/though